Yes, they're keeping themselves dry and out of the wind. If they were provided with a larger dry and wind-sheltered area they'd be making use of more space even in a colder temperature. I recently posted (I think on this thread), about my birds refusing to shelter from the rain on a similar day but, instead, foraging in their run, which I had provided with plenty of windbreaks.
Here are photos of my warm-climate chickens engaging with one of my rare winter snowfalls:
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They thoroughly explored that weird, white, wet stuff on the ground, decided that it wasn't good for eating or dustbathing, and went back into the coop where they had another feeder and waterer and dry deep litter to scratch in and dustbathe in.